Electromagnetic resonator.



L. GRUBMAN.

ELECTROMAGNETIC RESONATOR.

APPLICATION FILED MAR. I6. 1914 1,181 .446. Pfltvnfml May 2. 1916.

tINlT %TATE% PATENT? LEO GRUBMAN. OF NEW YORK. N. Y.. ASSIGNOR T0 ELECTRIC SPARK APPLIANCE CO. INC.. OF NEW YORK. N. Y.. A CORPORATION OF NEW YORK.

ELECTROMAGNETIC RESONATOR.

LI 831 AIMS.

Application filed March 16.

T1111 1/7111/1) it may Pon e/'11..

lie it known that I. laco tim'mmx. a c1ti zen of the l'nited States. and a resident of the borough of l'n'ooklyn. county of Kings. city and State of New York. have invented certain new and useful Improvements in IIha-tromagnetic ltesonators. of which the following is a specification.

My improvements relate to the class of resonators in which a diaphragm is vibrated bv means actuated by electro-magnetism. as for instance in connection with horns for directing sound warnings. or for analagous purposes. the object being to render the device simple and compact in its construction and arrangement of parts. and to eliminate all but the essential elements, at the same time rendering the device durable and ef 'fect ive.

The invention consists in the novel features described and claimed specifically. a distinctive feature being the utilization of the electro-magnet itself. particularly one member thereof. as a base or foundation plate upon which all-the other parts are mounted and supported. this basic member being dish-shaped, and accon'nnodating between it and the other member of the electro-magnet the electric. coil. and also the condenser when used in conjunction therewith. as hereinafter more fully set forth.

In the accompanying drawings, Figure 1. is a rear sectional elevation of my improved resonator. the section being taken through the casing only. and the circuits, &c.. being shown tliagrammatically and svmbolically; Fig. 2. is a central vertical sectional elevation of the device: Fig. 3. is an isometrical section of the dish-shaped member of the electro-magnet.

In my concurrent application No. 710.676, tiled July filth-1912. I show a somewhat similar construction of electrt'i-magnet. but in that application I confine myself more particularly to the antisparking means, method of winding. &c., whereas in the present case I seek to cover more particularly the mechanical construction and arrangement. of parts. Of these the more important is the magnetic member It. which to all intents and purposes practically constitutes the base or foundation plate upon which the rest of the structure is built up and supported. In cross section this basic member isessentially dish-shaped, and it; is prefer- Specification of Letters Patent.

Itatcnt ed May 2. t tit 6. Serial No. 825.114.

abl annular or cylindrical in external contiguration. Thus it may consist of a shallow cylindrical portion or annular wall 1/. having the outer peripheral flange 7/. and the inner disk flange 0", the latter formed with the central aperture o".-said inner annular disk flange 7). constituting the bottom. and the peripheral flange the annular lip. of the dish-shaped magi'ietic member i. the extreme inner edge 7)". of which forms one pole of the electro-magnct in action. The other pole is afforded by the central portion 1/. of the magnetic disk member I). of the electro-magnet. .which member I). is rigidly bound to the base member I. by screw bolts s. s. the two members It. I). of the magnet being positioned apart by intermediate mag netic spacing blocks or washers 1 1 The central portion 1/. of the disk member I). is preferably made in the form of a cylindrical boss projecting toward the central aperture 7/. of the member 13. so that the poles 1'1. 1/. arein operative proximity to each other and to the ari'nature A. the face 1?. of which latter protrudes into the central aperture 71". of the dish-shaped member I). as shown in Fig. 2.

The peripheral edge 17. of the disk member I). contacts with the inner surface of the cylixulrical wall 7), of the dish-shaptal member It. so as to connect magnetically therewith to form one limb of the electric magnet. The two said members B. D. are also connected magnetically by the spacing blocks 1 1].

The cylindrical boss 1/". is formed \vith...a

central guide opening in which is seated the reciprocating plunger 2. interposed loosely between the face a, of the armature A. and the resilient diaphragm It. The usual pulsations of the armatureA. under the influence of the intermittent attraction of the magnet I). I). are transmitted to the diaphragm It. by the plunger ).the retractile movement of the armature being effected by the resilience of the spring 11. upon which it is mounted. said spring being clamped between spacing blocks 11. 11". held in place against the rear side of the dish-shaped member 13. by the screw bolts s. 8'. While I prefer the loosely mounted plunger p, herein shown and described I do not necessarily limit myself thereto. since any inte 'mediate means for transmitting the vibratory movements of the armature A. to the resilient diaphragm R. may be substituted with substantially like result in so far as the other features of my structure are concerned. These screw bolts 8', s, also secure in position the bracket c. on which the adjustable interruption or make and break contact 1'. is mounted. said bracket and its supporting block c. being insulated from the bolts s. .v. and also carrying the binding screws c. c. by which connection is made with the circuit wires 1c. 1c. from the battery V.

The elastic resilient plate i. which in conjunction with the contact 1'. acts as the currentinterrupting means. is secured by the bolts .9. s, and spacing blocks 7-. I. to the rear side of the basic member T3. being insulated from said bolts by the usual method. This make and break spring plate '1". bears against a rest a. of insulating material on the armature A, and tends constantly to press the latter toward the poles of the electro-magnet B. D. which tendency is coun tera-cted normally by the spring 1/. upon which the armature ismounted.the arma tare spring a. in turn tending constantly through the medium of the rest. u. to main tain the interruption plate i. in electrical engagement with the contact i. on the bracket 0. thereby closing the electric circuit. Thus closed. the current energizes the magnet B, D. which deflects the armature causing the latter to strike the plunger and transmit the movement to the resilient diaphragm R.

The deflection of the armature A. allows the interrupting spring 1'. to break away from the contact screw 1'. and open the circuit. it being understood that said elements 2'. i. are included in the normal circuit. The opening of the circuit. thus effected. of course cuts oil the current from the coil the members B. D. are thereby demagnetized. and the armature A. is retracted by its spring support (1. carrying the plate 1". back into electrical engagement with the contact 5. and again closing the circuit. when the cycle is repeated so long as the battery circuit is maintained closed by means of the push button or equivalent device This is esentially theoperative method of most devices of this class, a feature of novelty in the present connection being the inclosure of the coil C. within the dish-shaped member B. of the magnet, and between said member and the disk-shaped member D. of said electro-magnet. as shown symbolically in Fig. 2. of the drawings. 'here a condenser is used in conjunction with the coil (7. interposed in the. usual manner in the spark gap. said con denser may be arranged at the side of the coil C or otherwise related thereto. Said condenser is also included between the magnetic members B. D. and like the coil connected up in a manner well known in the art,-my present invention as before intimated not relating especially to the'electric system. but rather the mechanical arrangement of parts.

The coil is positioned adjacent the central opening I). in the base member l3. and

around the cylindrical boss 17. on the other llltl'ltbtl' D. of the electro-magnet. as is also the condenser C. when used, and tor the centralization and support of the coil. or coil and condenseizas the case may be. an ammlar block m. of insulating material may be placed upon the pole boss 17*. as shown in Fig. 1 I

The rear casing K. is'secured by preference directly to the cylindrical wall 7;. of the dish-shaped member B: and in like manner the front cap L. may be attached to the peripheral flange. 7). of the dish-shaped member B. a spacing pad or washer 7. being interposed between. The horn H. may be mounted on the cap L. which latter atlords the usual resonance chamber 7 in front of the diaphragm R.

From the foregoing it will be readily seen that my device is unique in structure in that the magnet itself atlords isolation and support for the coil and condenser. while performing the function ot' a base on which all other parts of the device are mounted either directly or indirectly. Other advantages are. economy of construction: and efticiency of magnetic field. since all parts of the coil are in proximity to the magnetic current. Furthermm'e the armature and the pull thereon. being central. even and uniform action on the transmitting plunger is attained as compared with the use of the old form of two-coil electro-magnet and armature acting on a pin or stud attached directly to the diaphragm.

\Vhat I claim as my invention and desire to secure by Letters Patent is,

1. In an electroanagnetic resonator of the character designated. a two-part electro magnet consisting of a dish-shaped member formed with a central opening and a disk member titted within the dish-shaped memher and having a central projection opposite said opening, said members being arranged in close proximity to each other, an electric exciting coil positioned between them and inclosed by one of said members, a resilient diaphragm supported on the outer peripheral flange of the dish-shaped member, a retractile-armature supported at the rear side of said dish-shaped member and having a portion extending into said opening. and aplunger loosely seated inthe disk member and interposed between said diaphragm and armature for direct engagement with both. i

2. In an electro-magnetic resonator of the character designated. a two-part electromagnet consisting of a dish-shaped member formed with a central opening and a disk member fitted within the dish-shaped memher and having a central pole boss coincident with said opening, an electric exciting coil disposed between said members. a resilient diaphragm supported on the peripheral flang of the dish-shaped member. a retractile armature supported at the rear side of the dish-shaped member and formed with a part disposed opposite said opening. and loosely mounted means directly engageable with said armature and diaphragm.

3. In an electro-magnetic resonator of the character designated. a two-part electromagnet consisting of a dish-shaped member formed with a central opening and a disk member fitted within the dish-shaped member and having a central pole boss coincident with said opening. an electric ex citing coil disposed between said members. a resilient diaphragm supported on the peripheral flange of the dish-shaped member. a retractile armature supported at the rear side of the dish-shaped member and formed with a part disposed opposite said opening, loosely mounted means directly en gageable with said armature and diaphragm. and a current interru1')ter to the rear of said armature.

4. In an electro-imignetic resonator of the character designated, in combination. a two part electro-magnet consisting of a dishshaped member formed with a central opening and a disk member fitting said dishshaped member and formed with a central pole boss coincident with the central aperture in the latter. an electric exciting coil positioned between them. a resilient diaphragm supported on the peripheral flange of said dish-shaped member. a retractile armature supported upon the rear side of said dish-shaped member and formed with a part protruding into the central opening in said dish-shaped member. and means interposed between the resilient diaphragm and the said retractile armature for .transmitting the motion of said armature to said diaphragm. tor the purpose described.

In an electro-magnetic resonator of the character designated. in combination. a two part electro-magnet consisting of a dishshaped member formed with a central opening and a disk member fitting said dish shaped member and formed with a central pole boss coincident with the central aperture in the latter. an electric exciting'coil positioned between them. a resilient diaphragm supported on the peripheral flange of said dish-shaped member. a retractile armature supported upon the rear side of said dish-shaped member and formed with a part protruding into the central opening in said dish-shaped member. a plunger loosely seated in the central boss on said disk member and interposed between the resilient diaphragm and the said Ietractile armature, and current interrupting means also supported on the rear side ofsaid dishshaped member. for the purpose described.

(3. In an electro-magnetic resonator of the character designated. in combination. a two part elcctro-magnet consisting of a dishshaped member formed with a central opening and a dish member fitting said dishshaped member and formedwith a central pole boss coincident with the central aper Lure in the latter. an electric exciting coil and a condenser positioned between them. a resilient diaphragm supported or. the pe ripheral flange of said dish-shaped member. a retractile armature supported upon the rear side of said dish-shaped member and torn'ied with a part pri'itruding into the central opening in said dish-shaped member. a plunger loosely seated in the central boss on said disk member and interposed between the resilient diaphragm and the retractile armatm'e. and current interrupting means also supported on the rear side of said dislishaped member. for the purpose described.

7. In an electro-magnetic resonator of the character designated. an armature. :1 diaphragm. a two-partelectro-magnet consisting of a dislrshaped member t'orming the base and having an opening therein. and a disk member disposed within said dislrshaped member and having 2 portion extended toward said opening. and forming with the walls of said opening the poles of the magnet and means independent of said armature and diaphragm and movable axially through the disk member for direct contact with said armature and diaphragm.

8. In an clectro-magnetic resonator ol' the character designated. an armature. a diaphragm. a two-part electro-magnct consisting of a dish-shaped member forming the base and having an opening therein. and a disk meinber disposed within said dish-shaped member and having a portion extended toward said opening and forming with the walls of said opening the poles of the magnet. said members being arranged in proximity to each other and a coil surrounding said portion and means: independ- -ent of said armature and diaphragm and movable axiallv through the disk member for direct contact with said armature and diaphragm.

9. In an electro-magnctic resonator ot' the character designated. a twopartelectromagnet consisting oi a dislrshaped member forming the base and ha ving an opening therein. a disk member disposed within said dish-shaped member and having a portion extended toward said opening and iorminL with the walls of said opening the poles ol' the magnet. aid members being arranged in proximity to each other. a coil snrronmling said portion. and an armature movable in said opening.

10.111 an electrii-magnetic resonator of the character designated. a two-part electro magnet consisting of a dish-shaped member forming the base am] having an opening therein. a disk member disposed within sald dlsh-shaped member and having a por tion extended toward said opening and l'orming with the walls of said opening the poles olsaid magnet. said members being arranged in proximity to each other. a coil surrounding said portion. an armature movable in said opening. and a plunger movable in said portion and extended at one end to be engaged b said armature.

11. In an ele tro-magnetie resonator ot' the character designated. an armature. a diaphragm. a two-part electro-magnet con sisting ol' a dish-shaped member forming thebaseand ha\ ing an opening therein.and a disk member disposed within said dislishaped member and having a portion extended toward said opening. and Forming with the walls of said opening the poles oi the magnet. said members being disposed in proximity to each other. means independent ol the armature and diaphragm movable axially through the disk member for direct contact with said armature and diaphragm. a coil within the dish-shaped member and surrounding said portion. and cooperating means arranged in the rear ol said dislishaped member.

l2. In an electro-magnetic resonator ot the character designated. a two-part electromagnet consisting ol a dish-shaped member and a disk member litted therein. the dishshaped member having an opening therein,

the inner face of said member forming one pole of an electro-magnet, an armature, a diaphragm. a member disconnected from said armature and diaphragm and loosely movable through said disk member for direct contact with both the armature and diapli 'agn-i and an exciting electric coil interposed between the disk member and the bodv portion of the dish-shaped member.

13. In an electro-nuignetic resonator of the character designated. a dish-shaped member constituting a magnet and having a flange for direct support of a diaphragm. means for securing a diaphragm to said flange. a disk member within the dishshaped member. and a coil between the said two members. a diaphragm. and means in dependei'it of the. diaphragm and loosely movable through said disk member for direct contact with the diaphragm.

14. In an electro-magnetic resonator of the cha 'acter designated, a dish-slnjiped member constituting a magnet and having a tlange For direct support of a diaphragm, a diaphragm lllilllS for securing said diaphragm to said flange. a disk member within the dish-shaped member. a coil between the said two members. an arn'iature.

and means loosely movable through said,

disk member and indepen .lent of the armature and diaphragm and actuated by said armature to t 'ansmit movemei'lt to said diaphragm. Y

LEO GRUBMAN. Witnesses:

(lico. WM. Mrvr'r.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patent; Washington. D. C. 

